TOKYO -- The gap between winners and losers in Japan's auto industry widened Wednesday as the nation's top three car makers reported earnings and earnings estimates.

The biggest surprise came from Nissan Motor Co., which revised its forecast for the year ended March 31 to a consolidated net loss of 14 billion yen ($102.6 million). It previously had forecast 16 billion yen in net profit, compared with a net profit of 77.7 billion yen in the previous year. Nissan is scheduled to release its earnings next week. The auto maker...